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Math Help - determine the quadrant in which an angle lies. help!

  1. #1
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    determine the quadrant in which an angle lies. help!

    hello u math brainiacs i need help!

    how do i go about determining which quadrant the angle lies in?

    ex) -5pi/6 please explain thoroughly so i can take notes and as easy as possible because i tried and cant figure it out.

    thanks!
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    Re: determine the quadrant in which an angle lies. help!

    Quote Originally Posted by noork85 View Post
    how do i go about determining which quadrant the angle lies in? ex) -5pi/6
    \frac{-5\pi}{6} is equivalent to \frac{-5\pi}{6}+2\pi=\frac{7 pi}{6}.
    \frac{7 pi}{6}\in III WHY?
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    Re: determine the quadrant in which an angle lies. help!

    so thats it? just find the equivalent and then locate that equivalentbon on the unit circle?
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    Re: determine the quadrant in which an angle lies. help!

    and what about -11pi/9 i got the answer as 7pi/9 cant locate that on the unit circle...
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    Re: determine the quadrant in which an angle lies. help!

    Quote Originally Posted by noork85 View Post
    and what about -11pi/9 i got the answer as 7pi/9 cant locate that on the unit circle...
    Well \frac{1}{2}<\frac{7}{9}<1 so it is in II.
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    Re: determine the quadrant in which an angle lies. help!

    i understand what ur saying.

    what about when im given something like just 3.5?
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    Re: determine the quadrant in which an angle lies. help!

    Quote Originally Posted by noork85 View Post
    i understand what ur saying.
    what about when im given something like just 3.5?
    If \pi<3.5<\frac{3\pi}{2} in it is in III.
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    Re: determine the quadrant in which an angle lies. help!

    yes, ofcourse. y didnt i see that? thank you very very much!
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